Fluke 5500A, Service Manual

Page: 150 / 296

5500A
Service Manual
6-24
POWER
I
O
5790A AC MEASUREMENT
STANDARD
1000V RMS MAX 1000V RMS MAX
3V RMS MAX
INPUT 1 INPUT 2
SHUNT
HI
LO
GUARD GROUND
SHELL FLOATING
10V PEAK
MAX
WIDEBAND
7V RMS MAX
MAX
10V PK
SHELL FLOATING
INPUT1 SHUNT INPUT1 INPUT1 INPUT1
2.2 mV 22 mV 220 mV
7 mV 70 mV 700 mV
2.2 V 22 V 220 mV
7V 70V 700V
1kV 2.2 mV
AUTO MAN
VIEW
REF
UTIL
MENUS
SPEC
CLEAR
DELETE
ENTER
0 1 2 3 4 5
6
7
8 9
+/-
.
POWER
I
O
0 •
1 2 3
4 5 6
7 8 9
ENTER
M
k
m V Hz
FIELD
EDIT
/
+
F
OPR EARTH SCOPE BOOST MENU
PREV
SHIFT
RESET
CE
SETUP
REF
NEW
TC
MEAS
¡F
µ
n
p
W
dBm sec
¡C A
MULT
x
DIV
÷
OUT
TRIG
5500A CALIBRATOR
20V PK
MAX
HI
LO
TC
TRIG
OUT
1000V
RMS
MAX
20V
RMS
MAX
1V PK
MAX
20V PK
MAX
NORMAL AUX SCOPE
V, ,
RTD
A, -SENSE,
AUX V
200V PK
MAX STBY
om034f.eps
Figure 6-4. Connecting the Calibrator Mainframe to the 5790A AC Measurement Standard
6-38. Leveled Sine Wave Flatness Calibration
Leveled Sine Wave flatness calibration is divided into two frequency bands: 50 kHz to
10 MHz (low frequency) and >10 MHz to 600 MHz (high frequency). The equipment
setups are different for each band. Flatness calibration of the low frequency band is
made relative to 50 kHz. Flatness calibration of the high frequency band is made relative
to 10 MHz.
Leveled Sine Wave flatness is calibrated at multiple amplitudes. Both low and high
frequency bands are calibrated at each amplitude. Calibration begins with the low
frequency band, then the high frequency band for the first amplitude, followed by the
low frequency band, then the high frequency band for the second amplitude, and so on,
until the flatness calibration is complete.
Press the OPTIONS and NEXT SECTION blue softkeys until the display reads “Set up
to measure leveled sine flatness”.
6-39. Low Frequency Calibration
Connect the Calibrator Mainframe SCOPE connector to the 5790A WIDEBAND input
as described under “Equipment Setup for Low Frequency Flatness”.
Follow these steps to calibrate low frequency Leveled Sine Wave flatness for the
amplitude being calibrated.
1. Press the GO ON blue softkey.
2. Establish the 50 kHz reference:
•
Allow the 5790A rms reading to stabilize.
•
Press the 5790A Set Ref blue softkey. (Clear any previous reference by pressing
the 5790A Clear Ref blue softkey prior to setting the new reference if required.)
3. Press the GO ON blue softkey.
4. Adjust the amplitude using the Calibrator Mainframe front panel knob until the
5790A reference deviation matches the 50 kHz reference within 1000 ppm.
5. Repeat steps 1 to 4 until the Calibrator Mainframe display indicates that the
reference frequency is now 10 MHz. Continue with the high frequency calibration.